<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    [v-cloak] {
      display: none;
    }
  </style>
</head>
<body>

  <div id="app">
    <h2 v-cloak>{{message}}</h2>
  </div>
  
  <script src="../lib/vue.js"></script>
  <script>
    
    setTimeout(() => {
      // 1.创建app
      const app = Vue.createApp({
        // data: option api
        data: function() {
          return {
            message: "Hello Vue"
          }
        },
      })

      // 2.挂载app
      app.mount("#app")
    }, 3000)

  </script>
</body>
</html>